CN106277672A - A kind of sediment water interface Phosphurus release controls preparation method and the application of material - Google Patents
A kind of sediment water interface Phosphurus release controls preparation method and the application of material Download PDFInfo
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- CN106277672A CN106277672A CN201610797808.6A CN201610797808A CN106277672A CN 106277672 A CN106277672 A CN 106277672A CN 201610797808 A CN201610797808 A CN 201610797808A CN 106277672 A CN106277672 A CN 106277672A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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Abstract
The invention provides a kind of sediment water interface Phosphurus release and control preparation method and the application of material, described material is initiatively with lake sediment and kaolin mixture as base stock, the processing procedures such as oxidized, modification with Fe, pelletize and roasting, significantly reduce material to phosphatic adsorption-desorption equilibrium concentration EPC0Value, improves its linear distribution factor KdValue, sediment interstitial water phosphate concn can effectively be cut down by the material making the present invention, suppression sediment water interface phosphate release, owing to the phosphatic desorption ability of material itself is more weak, absorbability and buffer capacity are the strongest, and material the most of the present invention can really realize sediment water interface Phosphurus release is effectively hindered control.And the material of the present invention is drawn materials inexpensively, social and economic benefits and good, safety is high, does not has ecological risk, energy-conserving and environment-protective to water body in lake, in application process, difference lake region, Dian Chi sediment water interface Phosphurus release is controlled effect notable.
Description
Technical field
The present invention relates to preparation method and the application of a kind of Phosphorus Exchange at Sediment-water Interface release control material, belong to water environment
Environmental capacity field.
Background technology
Over nearly more than 30 years, due to socioeconomic development and the impact of mankind's activity, substantial amounts of xenobiotic pollutants enters lake
Moor and be enriched in deposit, make China's majority lake surface sediments suffer severe contamination.The survey showed that, and many lakes are especially
The substrate pollution of urban lakes is surprising, as in the deposit of many waters such as Taihu Lake, Dian Chi, Chaohu, total phosphorus content is up to 3000-
4000mg/kg.Deposit is not only important home to return to and the accumulation storehouse of pollution of water thing, but also is the weight of overlying water pollution
Endogenous, this is because there is sedimentation absorption and the homeostasis process of desorbing release, water body between deposit and overlying water
In phosphorus concentration be heavily dependent on the movement of this dynamic equilibrium, say, that sediment phosphorus migrates and release is depended on
The Concentraton gradient of Interstitial Water between adjacent two layers on the horizontal or vertical direction of column shaped deposit.At same vertical section, when upper
When surface sediments Interstitial Water phosphorus concentration is higher than lower floor, Phosphorus in Sediments hydrochlorate is vertically expanded between low concentration region by between high concentration region
Dissipate, define the trend that phosphate is migrated to layer deposition thing by surface deposit.On the contrary, dense when seabed sediment Interstitial Water phosphorus
When degree is higher than upper strata, phosphate is then migrated to surface deposit by layer deposition thing.Under normal circumstances, sediment interstitial water phosphoric acid
Salinity is higher than overlying water phosphate concn, it is considered that, just may cause water when the concentration of phosphorus reaches 0.02mg/L in water body
Body eutrophication.Therefore, effectively cutting down sediment interstitial water phosphate concn, controlling sediment phosphorus hydrochlorate to overlying water diffusion is
The important content that eutrophic lake internal loading controls.
Improvement and reparation to eutrophication water quality focus mostly in reducing external loadings, and in the release of Phosphorus in Sediments i.e.
Source Phosphurus release but can delay or offset the actual effect of above-mentioned measure, so the premise being effectively controlled at outside polluter
Under, the research of deposit internal loading becomes the key of pollution control of water.Soverlay technique is currently to control internal loading in situ
One of effective measures, because it is effective on endogenous Environmental capacity and less and receive extensively pass on water ecological setting impact
Note.The core of soverlay technique is to cover the selection of material in situ, and currently used more covering material has untainted bed mud, clear
Clean river sand, gravel, calcium bentonite, lime-ash, artificial zeolite, cement, also have such as calcite, flyash, geotextile or one
A little complicated man-made land sills etc..Such as, Chinese patent literature CN102775030A disclose a kind of using clean water sludge as
The method covering material, the method is by being dried the clean water sludge after dehydration, pulverize, sieve, then at the temperature of 500-600 DEG C
Lower calcination, obtains the clean water sludge of regeneration.This technology is by covering the clean water sludge of regeneration at the bottom of the pollution of water body to be repaired
Above mud so that polluted bed mud separates with overlying water physical property, on the one hand inhibit polluted bed mud endogenous pollution releasing to water body
Putting, the inorganic particle material based on metal-oxide on the other hand contained in clean water sludge also can be to the nitrogen phosphorus etc. in water body
Polluter produces and absorbs, and accelerates the migration to bed mud of the polluter in water body, is capable of counterweight to a certain extent
The water remediation of polluted river channel.
But above-mentioned technology uses the clean water sludge of waterworks as covering material, and the introducing of this xenobiotics is to water body
There is certain ecological risk in speech, and owing to the phosphate concn in water body is much smaller than the phosphate concn in clean water sludge,
Thus the phosphate in clean water sludge the most also can migrate to water body, cause above-mentioned covering material leading to its overlying water release phosphorus
Amount is big, thus this technology may effectively not remove the phosphorus in water body, that is to say, prior art still cannot use to be covered in situ
Lid technology really realizes the reparation to polluted water body, and this is a technology urgently to be resolved hurrily to those skilled in the art
A difficult problem.
Summary of the invention
The technical problem to be solved is to overcome prior art using clean water sludge as covering existing for material
The ecological risk of material own is high, the defect such as Phosphurus release risk is big, and then provide one to draw materials inexpensively, safety height, practicality
By force and low phosphorus hydrochlorate is had the preparation method of the Phosphorus Exchange at Sediment-water Interface release control material of stronger removal effect and answers
With.
To this end, the present invention realizes above-mentioned purpose technical scheme it is:
A kind of preparation method of Phosphorus Exchange at Sediment-water Interface release control material, including:
(1) gathering lake sediment, freeze-dried, grinding is sieved, and obtains deposit powder body, standby；
(2) taking Kaolin, drying, grinding are sieved, and obtain kaolin powder, standby；
(3) described deposit powder body and described kaolin powder mix homogeneously are formed mixed powder, standby；
(4) described mixed powder is carried out oxidation processes, and post-drying, standby；
(5) mixed powder after using iron salt solutions to aoxidize step (4) is modified processing, and post-drying, standby；
(6) mixed powder modified for step (5) is added water infiltration, the most extruded, the fired process of moulding material
After i.e. obtain Phosphorus Exchange at Sediment-water Interface release control material.
In described step (3), the quality of described kaolin powder accounts for the 10%-90% of described mixed powder gross mass, excellent
Elect 40%-60% as, more preferably 50%.
The granularity of described deposit powder body and described kaolin powder is all not less than 100 mesh.
Step (4) uses 5mol L-1HNO3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3
Aqueous solution is 50:1 with the mass ratio of described mixed powder.
Iron salt solutions described in step (5) is 0.20mol L-1FeSO4Aqueous solution, described FeSO4Aqueous solution and institute
The mass ratio stating mixed powder is 100:1.
In step (6), the temperature of described calcination process is 120-800 DEG C, preferably 120-700 DEG C, more preferably 700
℃；The time of described calcination process is 0.5-3h, preferably 1h.
In step (6), the addition of water accounts for the 5-30wt% of described mixed powder quality, preferably 10wt%.
Described Phosphorus Exchange at Sediment-water Interface release control material is the granule with 3-5mm particle diameter.
The Phosphorus Exchange at Sediment-water Interface release control material prepared by above-mentioned preparation method is as deposit situ capping materials
Purposes.
By described Phosphorus Exchange at Sediment-water Interface release control material-paving at the surface of contaminated sediment remediation, Polluted water area
It is required every year that the content of surface deposit total phosphorus often reduces the described contaminated sediment remediation of every square metre corresponding to 0.10mg/L
The dosage of described Phosphorus Exchange at Sediment-water Interface spatial load forecasting material is 0.23-19.71kg；
Phosphate concn in the Interstitial Water of described contaminated sediment remediation is 0.02-1.0mg/L.
The technique scheme of the present invention has the advantage that
1, the preparation method of Phosphorus Exchange at Sediment-water Interface release control material of the present invention, it is contemplated that lake sediment
Having dual role, it is " remittance " and " source " of phosphorus of phosphorus, owing to the source-sink transition process of deposit is difficult to control to, especially
It is when the initial phosphate concentration in water body is relatively low, and deposit can show phosphorus " negative adsorption " phenomenon, causes using and sinks
Long-pending thing as phosphorus controlled-release material also exist the entrained phosphate of material self can to overlying water-soluble go out risk, it is easy to cause water
The secondary pollution of body, ecological security is poor, this most just prior art cannot directly use lake sediment to prepare phosphorus control
Releasing the reason place of material, and in order to overcome drawbacks described above, the present invention is basic with deposit with kaolinic mixture first
Raw material, after the most oxidized, modification with Fe and calcination process, forms a kind of relatively low absorption-desorption that has as shown in Figure 1 and balances
Concentration (EPC0) and higher partition coefficient (Kd) Phosphorus Exchange at Sediment-water Interface release control material.Research proves, EPC0Value is with heavy
The relative size of long-pending thing-water termination soluble phosphate (SRP) content determines phosphatic migratory direction, EPC0It is worth the least,
Show by material the least to the flux of overlying water release phosphorus, and KdValue then reflects material and eases up phosphatic adsorption strength
Rush ability, KdIt is worth the biggest, shows that material is the strongest to phosphatic buffer capacity, adsorption strength is the biggest, be less susceptible to phosphorus
Desorbing.As can be seen here, Phosphorus Exchange at Sediment-water Interface release control material of the present invention can really realize to deposit-
Water termination Phosphurus release effectively hinder control, thus solve covering material of the prior art and ignore because pursuing phosphorus adsorbance simply
Big the caused problem that cannot effectively control sediment phosphorus endogenous pollution of material self Phosphurus release amount.
Specifically, preparation method of the present invention by use Kaolin as Phosphurus release control material raw material it
One, the characteristic that aluminium oxide is big to phosphatic adsorbance, crystallized ability is strong of high-load in the most available Kaolin, significantly
Reduce the adsorption-desorption equilibrium concentration of material itself, improve partition coefficient, thus between being advantageously implemented lake sediment
The phosphatic removal of low concentration and effective control of Phosphorus Exchange at Sediment-water Interface release in gap water；On the other hand utilize Kaolin certainly
The caking property of body is to guarantee that Phosphurus release controls the molding of material；The third aspect utilizes Kaolin to draw materials inexpensively, safety is high, practical
Property strong feature, it is possible to decrease Phosphurus release controls production cost and the ecological risk of material.It addition, preparation method of the present invention
By mixing raw material is aoxidized and modification, then coordinate high-temperature roasting, in material active iron oxygen thus can be greatly improved
The content of compound, to promote material to phosphatic adsorption capacity and adsorption strength, thus is more beneficial for realizing sediment-water
Effective control of interface Phosphurus release.
2, the preparation method of Phosphorus Exchange at Sediment-water Interface release control material of the present invention, preferably optimum calcination temperature
It is 700 DEG C, so can not only remove the moisture in deposit hole and the absorption carbonate on deposit and organic matter, increase
The porosity of big deposit and specific surface area, be conducive to improving the deposit absorbability to phosphorus, and can also activated deposition
The phosphorus of more difficult movement in thing, deposit is by occurring a certain degree of Mineral Transformation to make the phosphorus of activation be fixed once again subsequently,
Advantageously reduce the internal loading amount of sediment phosphorus.
3, the preparation method of Phosphorus Exchange at Sediment-water Interface release control material of the present invention, by making mixed powder
Grain is shaped to the granule that particle diameter is 3-5mm, then by the material-paving of the present invention after contaminated deposit surface, can be effective
That reduces bottom water body answers the disturbance to deposit of shear force and water body flow, and then the phosphorus advantageously reducing sediment resuspension is released
Put.
4, the preparation method of Phosphorus Exchange at Sediment-water Interface release control material of the present invention, the final material pair prepared
0.02-1.0mg/L sediment interstitial water removal rate of phosphate has reached 80%-98%；For difference lake region, Dian Chi deposit, open
Representing field in situ simulation lake sediment-water interface Phosphurus release process, simulation test is after 90 days, control of material group overlying water total phosphorus
Concentration reduces 7 to 36 times than matched group, and thus, material Coverage Control group Phosphorus Exchange at Sediment-water Interface burst size is cut than matched group
Subtract 73%-97%.
As a example by Caohai of Dianchi Lake, in current water body, the content of surface deposit total phosphorus (TP) is 0.30mg/L, sediment-water
The release iron at interface solubility total phosphorus (DTP) is 1.091mg/ (m2D), then TP value to be made is reduced to 0.20mg/L, if
Do not consider in deposit the further conversion of removable phosphorus, then 1 year domestic demand adds the amount of material of the present invention and is
0.23Kg/m2If considering that whole mineralisings are entered overlying by removable phosphorus major part during whole biogeochemical cycle
In water body, then 1 year domestic demand adds the amount of material of the present invention is 19.71Kg/m2.Visible, by by of the present invention
Material-paving is in contaminated deposit surface, it is possible to realize effectively hindering control to what Phosphorus Exchange at Sediment-water Interface discharged.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the specific embodiment of the invention, below will be in detailed description of the invention
The required accompanying drawing used that describes be briefly described, it should be apparent that, the accompanying drawing in describing below is some of the present invention
Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to these
Accompanying drawing obtains other accompanying drawing.
Fig. 1 is that control material of the present invention is to phosphatic absorption-desorption curve chart；
Fig. 2 is that control material of the present invention is to phosphatic adsorption-desorption equilibrium concentration (EPC0) and partition coefficient
(Kd) with the curve chart of Kaolin percentage change in material；
Fig. 3 a～3f represents sintering temperature respectively and is followed successively by 120 DEG C, 200 DEG C, 300 DEG C, 450 DEG C, 550 DEG C of 700 DEG C of time systems
Standby controls the curve chart that phosphatic clearance is changed by material with initial phosphate concentration；
Phosphorus Exchange at Sediment-water Interface is released by the on-the-spot simulated conditions material in situ in Fig. 4 a～4d corresponding experimental group 1～4 respectively
Put control design sketch.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described enforcement
Example is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
As long as additionally, technical characteristic involved in invention described below difference embodiment does not just constitute conflict each other
Can be combined with each other.
Deposition feedstock in following embodiment picks up from Dian Chi 24 ° 53 ' 55.31 " N and 102 ° 40 ' 35.92 " E, with Dian Chi
The quality meter of deposit, the loss on ignition of described Phosphorus in Sediment of Dianchi Lake is 20.23wt%, contains in described Phosphorus in Sediment of Dianchi Lake
The SiO of 30.07wt%2, the Al of 23.93wt%2O3, the Fe of 20.51wt%2O3, 0.32wt% CaO, 0.93wt% MgO,
The Na of 0.18wt%2The K of O, 3.08wt%2The TiO of O and 0.75wt%2；
Kaolin is purchased from Zhengzhou West Germany profit chemical plant；
Muffle furnace is purchased from Germany's Na Bore Muffle furnace, model: L5/11/P330+.
Embodiment 1
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, after freeze-dried, grinding is sieved, obtains the granularity deposition not less than 100 mesh
Powder, standby；Taking Kaolin, drying, grinding are sieved, and obtain granularity and are not less than 100 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 10wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
5wt%, is then squeezed into graininess, and molding mass, in 120 DEG C of roasting 2h, i.e. prepares the Phosphorus Exchange at Sediment-water Interface that particle diameter is 3-5mm
Release control material.
Embodiment 2
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 150～200 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 150～200 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 80wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
10wt%, is then squeezed into graininess, and molding mass, in 200 DEG C of roasting 3h, i.e. prepares the water/sediment interface that particle diameter is 3-4mm
Phosphurus release controls material.
Embodiment 3
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 120～300 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 120～300 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 70wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
15wt%, is then squeezed into graininess, and molding mass, in 300 DEG C of roasting 1h, i.e. prepares the water/sediment interface that particle diameter is 3-4mm
Phosphurus release controls material.
Embodiment 4
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 100～300 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 100～300 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 60wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
20wt%, is then squeezed into graininess, and molding mass, in 450 DEG C of roasting 1.5h, i.e. prepares sediment-water circle that particle diameter is 4-5mm
Face Phosphurus release controls material.
Embodiment 5
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 100～200 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 100～200 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 50wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
20wt%, is then squeezed into graininess, and molding mass, in 700 DEG C of roasting 1h, i.e. prepares the water/sediment interface that particle diameter is 3-4mm
Phosphurus release controls material.
Embodiment 6
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 100～250 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 100～250 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 40wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
15wt%, is then squeezed into graininess, and molding mass, in 550 DEG C of roasting 1h, i.e. prepares the water/sediment interface that particle diameter is 3-5mm
Phosphurus release controls material.
Embodiment 7
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 150～200 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 150～200 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 30wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
30wt%, is then squeezed into graininess, and molding mass, in 700 DEG C of roasting 0.5h, i.e. prepares sediment-water circle that particle diameter is 3-4mm
Face Phosphurus release controls material.
Embodiment 8
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 100～200 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 100～200 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 20wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
15wt%, is then squeezed into graininess, and molding mass, in 800 DEG C of roasting 1h, i.e. prepares the water/sediment interface that particle diameter is 3-4mm
Phosphurus release controls material.
Embodiment 9
Phosphorus Exchange at Sediment-water Interface release control material described in the present embodiment prepares by the following method:
(1) gathering bottom mud in lake is raw material, and after freeze-dried, grinding is sieved, obtaining granularity is that 150～200 purposes are sunk
Long-pending powder, standby；Taking Kaolin, drying, grinding are sieved, and obtaining granularity is 150～200 mesh kaolin powders, standby；
(2) described deposit powder body and kaolin powder are thoroughly mixed to form mixed powder, described Kaolin in proportion
Consumption account for the 90wt% of mixed powder gross mass, standby；
(3) HNO of 5mol/L is utilized3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Aqueous solution and institute
The mass ratio stating mixed powder is 50:1, and is evaporated in being placed on air dry oven, takes out and is cooled to room temperature；
Then the FeSO of 0.2mol/L is utilized4Mixed powder after oxidized is modified processing by aqueous solution, described
FeSO4Aqueous solution is 100:1 with the mass ratio of described mixed powder, and is evaporated in being placed on air dry oven, and taking-up is cooled to
Room temperature is standby；
(4) mixed powder modified for step (3) being added water infiltration, the addition of water accounts for described mixed powder quality
10wt%, is then squeezed into graininess, and molding mass, in 700 DEG C of roasting 0.5h, i.e. prepares sediment-water circle that particle diameter is 4-5mm
Face Phosphurus release controls material.
Experimental example
The present invention is respectively provided with absorption-desorption experiment and the experiment of water/sediment interface scene in-situ control, to investigate this
The using effect of the Phosphorus Exchange at Sediment-water Interface release control material that invention prepares.
1, absorption-desorption experiment
Configuring close to sediment interstitial water phosphorus concentration scope under the natural conditions of lake is 0～1.0mg/L (to be i.e. respectively provided with
Be 0,0.02,0.05,0.10,0.20,0.30,0.50 and 1.0mg/L) water sample；Weigh material dry sample 0.5g to be centrifuged in 100mL
Guan Zhong, is separately added into the water sample solution of the above-mentioned variable concentrations of 50mL, and the 24h (200rpm) that vibrates under 25 DEG C of environment is flat to absorption
Weighing apparatus；Take out centrifuge tube, centrifugal 15min under 5000rpm, take supernatant and obtained filtrate by 0.45 μm filter membrane sucking filtration, measure SRP dense
Degree；Take appropriate filtrate in 25mL color comparison tube, be settled to 25mL with distilled water, add 10% ascorbic acid of 0.5mL, shake up,
Adding 1mL molybdate solution after 30s fully to mix, develop the color 15min, makees reference with ultra-pure water, and colorimetric under 700nm wavelength is surveyed
Determine phosphorus concentration in solution.
Calculated by experimental data, it is thus achieved that the material of different Kaolin content as shown in Figure 1 is to phosphatic absorption-solution
Inhale curve；Recycling linear distribution model fitting operation, it is thus achieved that each material, to phosphatic adsorption-desorption equilibrium concentration, is shown in figure
2, wherein, linear equation is as follows:
Q=b+KdC
EPC0=(-b)/Kd
In above formula, Q is that material is to phosphatic equilibrium adsorption capacity, mg/kg；C is balance solution concentration, mg/L；EPC0For
Adsorption-desorption equilibrium concentration, KdFor linear distribution factor.
From figure 2 it can be seen that phosphatic adsorption-desorption equilibrium concentration is by the kaolinic material Han 10wt%
0.03mg/L, partition coefficient KdValue is 5.6L/g, along with the increase of Kaolin proportion, EPC0Present downward trend, minimum
It is 0.0035, reduces nearly 10 times, but KdValue but presents downward trend after first rising, and peak occurs in containing 50wt% Kaolin
Material in, for 33.6L/g, improve more than 5 times, therefore deduce that the optimum proportioning of material of the present invention, i.e. deposit with
Kaolinic mass ratio is 1:1.
Fig. 3 a～3f show the material prepared by the different sintering temperatures sediment interstitial water to having different phosphate concentration
In phosphatic removal effect, from Fig. 3 a～3f it can be seen that there is the highest phosphoric acid all the time through material obtained by 700 DEG C of roastings
Salt clearance, thereby determines that the optimum calcination temperature of preparation method of the present invention is 700 DEG C.
2, water/sediment interface scene in-situ control experiment
Gather the column shaped deposit of difference lake region, Dian Chi, be placed on after transporting laboratory back in indoor column analog,
And the thickness regulating deposit is about 20cm, siphon is then utilized to remove overlying water；Produce for avoiding material to cover rear interface
Differential settlement, places a specific thin layer pvc filter disc so that it is level covers immediately on deposit top layer after removing overlying water
Produce consolidation effect on deposit top layer and don't to deposit, above pvc filter disc, cover the material that the embodiment of the present invention 5 prepares
Material, selects some position, 4, difference lake region, Dian Chi, if four groups of parallel laboratory tests, respectively experimental group 1, experimental group 2, experimental group 3 and experiment
Group 4.This experimental example processes to cover material for control, to be not provided with cover layer as control treatment.Control for reinforcing material is imitated
Really, after overlying water uses aeration, the artificial lake water of (regulation water body DO is about 9.0mg/L) substitutes, and its concrete configuration method is with reference to literary composition
Offer Assessing the effectiveness of thin-layer sand caps for contaminated
sediment management through passive sampling(Lampert D J,Sarchet W V,Reible D
D, Environmental science&technology, 2011,45 (19): 8437-8443), the overlying water degree of depth is 30cm.
In the training period, take water sample 100mL at the 5cm of cover layer (or deposit layer) top and be used for measuring phosphate concn,
In Fig. 4 a～4d respectively corresponding experimental group 1～4, in overlying water after covering control of material process and control treatment, phosphate is dense
Spending the curve chart with simulated time change, the monitoring result of 4 months shows, control material prepared by the method for the invention is to Yunnan
The sediment phosphorus release of difference lake region, pond is respectively provided with and significantly controls effect, and control of material group overlying water total phosphorus concentration drops than matched group
Low 7 to 36 times, thus, material Coverage Control group Phosphorus Exchange at Sediment-water Interface burst size reduces 73%-97% than matched group.
Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right
For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or
Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (10)
1. the preparation method of a Phosphorus Exchange at Sediment-water Interface release control material, it is characterised in that including:
(1) gathering lake sediment, freeze-dried, grinding is sieved, and obtains deposit powder body, standby；
(2) taking Kaolin, drying, grinding are sieved, and obtain kaolin powder, standby；
(3) described deposit powder body and described kaolin powder mix homogeneously are formed mixed powder, standby；
(4) described mixed powder is carried out oxidation processes, and post-drying, standby；
(5) mixed powder after using iron salt solutions to aoxidize step (4) is modified processing, and post-drying, standby；
(6) mixed powder modified for step (5) is added water infiltration, the most extruded, after the fired process of moulding material i.e.
Obtain Phosphorus Exchange at Sediment-water Interface release control material.
The preparation method of Phosphorus Exchange at Sediment-water Interface release control material the most according to claim 1, it is characterised in that institute
Stating in step (3), the quality of described kaolin powder accounts for the 10%-90% of described mixed powder gross mass, preferably 40%-
60%, more preferably 50%.
The preparation method of Phosphorus Exchange at Sediment-water Interface release control material the most according to claim 1 and 2, it is characterised in that
The granularity of described deposit powder body and described kaolin powder is all not less than 100 mesh.
4. according to the preparation method of the Phosphorus Exchange at Sediment-water Interface release control material described in any one of claim 1-3, its feature
It is, step (4) uses 5mol L-1HNO3Aqueous solution carries out oxidation processes, described HNO to described mixed powder3Water-soluble
Liquid is 50:1 with the mass ratio of described mixed powder.
5. according to the preparation method of the Phosphorus Exchange at Sediment-water Interface release control material described in any one of claim 1-4, its feature
Being, the iron salt solutions described in step (5) is 0.20mol L-1FeSO4Aqueous solution, described FeSO4Aqueous solution is with described
The mass ratio of mixed powder is 100:1.
6. according to the preparation method of the Phosphorus Exchange at Sediment-water Interface release control material described in any one of claim 1-5, its feature
Being, in step (6), the temperature of described calcination process is 120-800 DEG C, preferably 120-700 DEG C, more preferably 700 DEG C；Institute
The time stating calcination process is 0.5-3h, preferably 1h.
7. according to the preparation method of the Phosphorus Exchange at Sediment-water Interface release control material described in any one of claim 1-6, its feature
Being, in step (6), the addition of water accounts for the 5-30wt% of described mixed powder quality, preferably 10wt%.
8. according to the preparation method of the Phosphorus Exchange at Sediment-water Interface release control material described in any one of claim 1-7, its feature
Being, described Phosphorus Exchange at Sediment-water Interface release control material is the granule with 3-5mm particle diameter.
9. the Phosphorus Exchange at Sediment-water Interface release control material conduct prepared by the preparation method described in any one of claim 1-8
The purposes of deposit situ capping materials.
Purposes the most according to claim 9, it is characterised in that described Phosphorus Exchange at Sediment-water Interface release control material is spread
Being located at the surface of contaminated sediment remediation, it is every that the content of Polluted water area surface deposit total phosphorus often reduces corresponding to 0.10mg/L
The dosage of the described Phosphorus Exchange at Sediment-water Interface release control material that square metre described contaminated sediment remediation is required every year is
0.23-19.71kg；
Phosphate concn in the Interstitial Water of described contaminated sediment remediation is 0.02-1.0mg/L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107253764A (en) * | 2017-06-25 | 2017-10-17 | 中国环境科学研究院 | A kind of making of water body in lake water quality purification material and application method |
| CN110316782A (en) * | 2019-07-02 | 2019-10-11 | 成都理工大学 | A kind of covering material inhibiting sediment phosphorus release |
| CN114700034A (en) * | 2020-12-07 | 2022-07-05 | 中国环境科学研究院 | Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775030A (en) * | 2011-05-13 | 2012-11-14 | 苏州科技学院 | Method for using purified water sludge as severely-polluted river sediment masking agent |
| CN105693067A (en) * | 2016-04-01 | 2016-06-22 | 华侨大学 | Method for preparing sediment covering material by sludge recycling of water treatment plant |
-
2016
- 2016-08-31 CN CN201610797808.6A patent/CN106277672B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775030A (en) * | 2011-05-13 | 2012-11-14 | 苏州科技学院 | Method for using purified water sludge as severely-polluted river sediment masking agent |
| CN105693067A (en) * | 2016-04-01 | 2016-06-22 | 华侨大学 | Method for preparing sediment covering material by sludge recycling of water treatment plant |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107253764A (en) * | 2017-06-25 | 2017-10-17 | 中国环境科学研究院 | A kind of making of water body in lake water quality purification material and application method |
| CN110316782A (en) * | 2019-07-02 | 2019-10-11 | 成都理工大学 | A kind of covering material inhibiting sediment phosphorus release |
| CN110316782B (en) * | 2019-07-02 | 2021-11-26 | 成都理工大学 | Covering material for inhibiting release of phosphorus in sediment |
| CN114700034A (en) * | 2020-12-07 | 2022-07-05 | 中国环境科学研究院 | Nitrogen-controlling and aquatic plant habitat repairing material and preparation method and application thereof |
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